Guiding arrangement for webs, comprising two movable pairs of rollers



July 30, 1957 w, WALTER r 2,801,102

GUIDING ARRANGEMENT FOR WEBS, COMPRISING TWO MOVABLE PAIRS OF ROLLERS 2 Sheets-Sheet 1 Filed 'Aug. 12, 1952 fry/enters W. 12162 Z681 11?. Z1? 5.5 17/ July 30, 1957 w. WALTER EI'AL 7 2,801,102

GUIDING ARRANGEMENT FOR WEBS, COMPRISING TWO MOVABLE PAIRS 0F ROLLERS Filed Aug. 12, 1952 Z'Sheets-Sheet 2 jymlraaz f m jgz United" Sitates Patent GUlDlN-G ARRANGEMENT FOR WEBS, COMPRIS- ING TWU MGVABLE PAIRS 9F ROLLERS Willy Walter, Gladlaaeh, and Walter Miessen, Viersen, Rhineland, Germany, assignors to A. R'ionforts, M. Gladbaclr, Germany, a German firm Application August 12, 1952, Serial No. 333,991

Claims priority, application Germany August 20, 1%1

9 Claims. (Cl. 2712.6)

The invention relates to a guiding arrangement for Webs, comprising two movable pairs of rollers guiding the marginal zones' or edges of a web. Such guiding arrangements are in use especially in the textile industry and they have the characteristic feature that the two pairs of rollers are displaced, when the web runs out, in such a way that the web finally returns into its normal running direction. The known arrangements of this kind have the disadvantage that after the one pair of rollers is displaced by the web the other pair is not adjusted into the correct position before a certain interval, in other words, the deviation from the normal course continues for an unduly long time. Also the irregularities of the path caused thereby are undesirable.

This drawback is fully avoided by the present invention, which has for an object to provide an arrangement in which the two pairs of rollers are coupledwith each other by a leverage in such a Way that the displacement of the one pair of rollers caused by the deviation of the Web simultaneously causes a positive adjustment of the other pair of rollers in a direction for returning the web into the normal course.

Therefore, the web is returned into the normal position or course practicafly without any delay after a deviation of the web is detected by the one pair of rollers.

According to a further feature of the invention suitable damping means are provided, for example, pneumatic oscillation or shock absorbers for the purpose of diminishing or balancing larger oscillations of the pairs of rollers, if any, disturbing the working.

The invention is not restricted to the guiding of webs in the textile industry proper, but may also be used advantageously for guiding other endless strips, such as paper webs and so on.

The conditions of a quick adjustment or reaction are especially favorable if, according to the invention, the rollers consist of a plurality of discs mounted for independent rotation relative to one another. In such constructions the individual parts of the rollers may rotate with different speeds whereby, due to the subdivision, their resistance against a swinging movement is smaller than that of the known rollers consisting of one piece. In consequence thereof the guiding rollers react quicker and return the web into the correct path in a shorter time.

In certain cases it may suffice to subdivide only one roller of a pair of rollers; it may also be suflicient to subdivide only one portion of a roller, preferably that portion which mainly engages the web.

Still another feature of the invention consists in that the rollers of one pair of rollers may change their axial position relatively to each other so that the axes are not always parallel to each other but are inclined and include an acute angle, that is, that the rollers spread apart, especially if a thicker fabric is involved.

According to a further development of the invention each pair of rollers is provided with a braking device arranged preferably behind the respective pair of rollers in the running direction of the web. Braking devices are already known in combination with web guides not coupled with each other and shaped, for example, like forks. These braking devices of known construction have, however, the disadvantage that they strongly stress the web thereby stretching it. The rollers may be used, in consequence of their subdivision,-instead of forks, rolls and so on, and secure the reconduction of the Web by essentially smaller forces.

Further details may be seen from the following description of two embodiments of the invention illustrated in the accompanying drawings.

In the drawings:

Fig. l is a diagrammatical illustration of a web guide according to one form of the invention,

Fig. 2 illustrates in plan a pair of rollers, in accordance with a second embodiment of the invention,

Fig. 3 is a sectional View taken along lines 3-3 of Figure 2, and

Fig. 4 shows both pairs of rollers with the web passing between them, in a schematic plan view and on a reduced scale.

In Fig. 1 the two pivotally supported pairs of rollers are designated with the reference numerals 1 and 2, the said rollers engaging the marginal zones 3 and 4 of the web. The two pairs of rollers are connected with each other by a leverage 5, 5a, 5b, the length of the lever 5 being adjustable by means of a sleeve 50.

In the diagrammatic arrangement of Figure 1, the pairs of rollers 1 and 2 are each mounted for rotation in frame brackets 1a and 2a respectively. The bracket 1a and thus the pair of rollers 1 are pivoted for swinging motion about the axle A while the frame bracket 20 is swingable about the axle B. These axles A and B are perpendicular to the plane of the passing web W. Thus, since the axles of the rollers of each pair are perpendicular to the axles A and B respectively, the contact line of the rollers of each pair in every position of the rollers lies substantially in the plane of the web. In the position shown in Figure l which is the median position of the arrangement, the axles of the rollers of each pair lie at an angle to the opposite edges of the web. The inclination of the axes of the rollers 2 is opposite to that of the inclination of the axes of the rollers 1. Rotary motion is imparted to the rollers of each pair by the movement of the web in the direction of the arrow C. By the connecting linkage 5a, 5 and 5b, the swinging motion of the pairs of rollers are coupled together. As indicated by the dotted line A, the extension of the axle A lies somewhat within the outer marginal edge of the web. In a normal operation with the web moving in the direction of the arrow C, the inclination of the axes of the respective roller pairs with respect to the right and left-hand marginal edges of the web, will be equal. While the web is in motion, a turning moment is exerted on the rollers ofeach roller pair, that is a turning moment about the axles A and B respectively. If the moment of rotation is equal on both sides of the web, that is, if the lever arm lengths D and E extend within the marginal edges of the web to substantially the same extent the turning moment acting on the roller pair 1 is equal to that acting on roller pair 2. If, however, the web deviates as for example, the marginal edge 3 passes further into the bite of the rollers 1 and the marginal edge 4 moves toward the free ends of the rollers 2, then the turning moments of the two roller pairs are unequal and thus the turning moment of the roller pair 1 transmits this moment through the connecting leverage or linkage to the frame bracket of the other roller pair whereby the second roller pair moves as a unit. This movement causes the slanting position of the other roller pair 2 to move in the opposite sense so as to be of increased inclination. This movement of the rollers imparts to the moving web an adjusting movement 3 V occasioned by the increased slanting position of the second roller pair so that the web is guided back to its previous path and thus the movement imparted to the roller pair 2 compensates for the deviation detectegl by the roller pair 1. This is occasioned bythe fact that when the inclination of the axes of the roller pair 1 relative to the axles of the web decreases, that is, when moved in the direction of the arrow 1', this roller pair l exerts a lesser pull in the direction of the edges of the web whereby the movement of the roller pair 2-in the opposite direction simultaneously exerts a greater pull in the direction of the edges of the web so that the restoration of the web to its proper course of movement is quickly eifected. V

Any oscillations of the pairs of rollers and of the leverage arising sometimes if the web passes, are ab- I sorbed by damping devices indicated in the drawingby the reference numeral 6, having for example the form of a pneumatic oscillation absorber. The pneumatic oscillation or shock absorber is of conventional construction and includes a cylinder 6a suitably mounted in the portion of the machine frame 6b and a piston 6c operable in the cylinder. An arm 6d is connected to the frame bracket 1a at one end and by a universal connection or joint is operably coupled with the piston 6c at its other end.

' Any displacement of the pair ofrollers 1 in the direcreference to Figure 1.

By subdividing the rollers according to the invention,

said tilting movement becomes quicker and more efiective than with the known pairs of rollers consisting of one piece. By quickly returning the web into its normal path the web may be better Wound-up, guided or stacked.

What we claim is: i

1. A guiding arrangement for guiding a moving web along a proper path comprising in combination, a pair of superposed rollers disposed to extend inwardlyand outwardly from opposite marginal edges of the web to be guided and between which pairs of rollers the web passes, said pairs of rollers being substantially similarly inclined toward each other in the direction of movement of the web, supporting means pivotally supporting each pair of rollers for swinging movement about anaxis normally located at the edge of the web. perpendicular to the plane of the web' and mechanical coupl ing'means con-.

necting the supporting means and operatively related to thesupporting means 'of both pairs :of rollers, whereby upon lateral deviation ofth'e web from its proper path .jmpartin'g an increasing turning momentto the supporttion of the arrow 1' causes immediately the displacement of the pair of rollers 2 in the direction of the arrow 2" whereby a deviation of the web is prevented'at once. 7

In the embodiment shown in Figs. 2 to 4 each pair of rollers includes rollers 12 and 13 supported by a frame, f

11. Both rollers of each pair consist of a set of discs a to h journalled on shafts 14 and 1 5 respectively. While the shaft 14 is directly connected to the frame 11, the shaft 15 is carried by a fork or yoke 16 adapted to oscillate around the axis of its shaft butt 17. This shaft butt 17 is supported by a bearing '18 forming simultaneously one arm of a bell crank lever'19 actuated by a spring 110 forpressing the roller 13 against the roller',12.,.The

frame 11 is provided with a bolt'111 adapted to berotatably supported in a suitable bearing'on the machine frame, not shown in the drawing. The axis of said bolt 111 intersects the axis of the rollers 12 and 13. at a point outside themiddle of said axes. A counterweightj112 balancing the weight ofthe frame is provided. on the frame, said counterweight being adjustable .along a threaded bolt 112. Additionally, anarm 113 is attached to the frame and a force transmitting rod 114 is pivotally connected. thereto and also to a corresponding arm at'the fralme of the other pair of rollers at'the other side of the we Behind the pair of rollers and 13, in the running direction of the web, is a braking device consisting of two rolls'116; Each of these rolls maybe of one piece or may be composed of a set of discs like the arrangement of rollers'12 and 13. If the rolls 116 are subdivided the elastic 'force of the individual discs may be a difierent one whereby their 'efliciency may be increased. The rolls 116'are short enoughso as-to extend only over a short region at the edges. 7 7

When setting the guiding'deviceto-work' the web 115 runs between the two pairs of rollers 12 and 13;

lf marginal strips of the webfof equal width are engaged between the two pairs of rollers at the right hand and the left hand side respectively'the turning movements exerted to the pairs of rollers by the rod 114 and the arm 113 are balanced. The rollers are obliquely positioned in the running direction of the web approximately as shown in Fig.4. If,however, the web is displaced so that a marginal strip which passes between thepair of rollers at the one side is larger in width than the Width of {the marginal strip, that'is passing between the pair of rollers at the other side then. turning moments "arise at both pairs of rollers and the two pairs of rollers tilt under the action of these turning moments so as to return the ing means for one pair of rollers and a'decreasing turning moment to the. supporting means'for. the other said pair ,of rollers, said coupling means resp'onsive to the said, turning moments assuring concerted motion of said pairs of rollers whereby upon deviationof said web from its proper-path said pairs of rollers automz'rtically on their pivotstojbias. said web toward its proper path.

2. A guiding arrangementias defined in claim 1 in which said coupling means is adjustable so as to acc'orn- I modate webs of difierent widths. l

3."A guiding arrangementas defined claim 1 and combination damping means cooperatively associated with said coupling means. I s

4. A guidingarrangenient for webs as defined in claim 1 and includingipneuma'tic shock absorbing means cooperatively associated with the'sup porting means of at least one pair of rollers.

5. A guiding arrangement as ie" ed inelaim Lander least one of the rollers, of eachpair consisting of a set of independently rotatable discs. mounted on a common axis.

6. A guiding arrangement for webs as defined in claim 1 and at least a portion of one of the rollers of each pair consisting of independently rotatable discs. 7. A guiding arrangement as defined in claim l in which the supporting means for the 'p'airs'of rollers includes means supporting at least one roller of each pair for movement relative to the other rollen.

superposed freely rotatable roller means laterally spaced with respect to the direction of movement ofthe web to be guided, mounting means for supporting the roller means with their axes substantially parallel to the plane of the web, each of said roller means including ends adapted to be disposed inwardly. of the marginal zones of the. web whereby the portion of a webpassing'between the roller means of each pair rotates the same and ends extending outwardly from the marginal zones of the web, said roller means normally having their axes inclined relative to the marginal edges of the web and at substantially equal but opposite inclinations and said mounting means including pivot means for each pair of roller means, said pivot means being directed perpendicular to the plane of the web to be guided, said pivot means being located substantially at the marginal edge of the web, and mechanical coupling means operatively associated between the pairs of roller means and operative to impose the turning moment of each pair of rollers on the other 7 web into the correct path as previously described with 8. A web guiding arrangement comprising two pairs of V ranged near one face of the cloth, holders arranged adjacent to said face and extending transversely thereof, means to pivotally mount the holders upon the support substantially at the edge of the cloth, rollers carried by the holders and extending longitudinally of the holders inwardly and outwardly of the edge of the cloth, arms secured to the holders adjacent to their pivots and arranged upon the same side of the holders, and a rod means pivotally connected with the arms.

References Cited in the file of this patent UNITED STATES PATENTS Wait Apr. 8, Smith Feb. 4, Bolton Aug. 21, Smith June 9, Hornbostel Nov. 25, Robertson Feb. 8, Phelps Aug. 10, Wright Sept. 20,

FOREIGN PATENTS Germany Mar. 7, 

